<!doctype html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="index.css">
    <title>css解密</title>
</head>
<body style="background: #eee;">
<h1>半透明边框</h1>
<div class="btmbk">
    半透明边框
</div>
<br>
<h1>多重边框</h1>
<div class="dcbk">
    多重边框
</div>
<div class="dcbk2">
    多重边框-outline方案
</div>
<div class="fbxg">
    缝边
</div>
</body>
</html>